package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setMealDishMapper;


    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 1.向菜品表中插入数据
        dishMapper.insert(dish);
        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        // 2.向菜品对应的口味表中插入数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors == null || flavors.size() == 0) return;

        flavors.forEach(dishFlavor -> {
            dishFlavor.setDishId(dishId);
        });

        dishFlavorMapper.insertBatch(flavors);

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Override
    public void deleteBatch(List<Long> ids) {

        ids.forEach(id ->{
            // 1.根据id获取每一个菜品，
            Dish dish = dishMapper.getById(id);
            // 判断是否起售
            if(dish.getStatus() == StatusConstant.ENABLE) {
                // 起售中，不可删除。
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

        });

        // 判断菜品是否关联套餐
        List<Long> setMealIds = setMealDishMapper.getSetMealIdsByDishId(ids);
        if(setMealIds != null && setMealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        for (Long id : ids) {
            // 删除菜品数据
            dishMapper.deleteById(id);

            // 删除菜品后，关联口味数据也要删除
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        // 1.修改菜品表数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        // 2.删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 3.重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        flavors.forEach(flavor -> {
            flavor.setDishId(dishDTO.getId());
        });
        dishFlavorMapper.insertBatch(flavors);
    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);

        List<DishFlavor> flavors = dishFlavorMapper.getById(id);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id).build();

        dishMapper.update(dish);
    }

    @Override
    public List<Dish> getByCategoryId(Long categoryId) {

        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        List<Dish> dishes = dishMapper.getByCategoryId(dish);
        return dishes;
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.getByCategoryId(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
